@Override
  public void actionPerformed(ActionEvent e) {
    EntryReader er = new EntryReader();
    String entriesFilename = entriesTxt.getText();
    if (entriesFilename.isEmpty()) {
      errorLabel.setText("Entries filename must not be empty.");
      return;
    }
    Map<Branch, List<Entry>> entries;
    try {
      entries = er.read_entries(entriesFilename);

      Set<Branch> keys = entries.keySet();

      String prizesFilename = prizesTxt.getText();
      if (prizesFilename.isEmpty()) {
        errorLabel.setText("Prizes filename must not be empty.");
        return;
      }

      Map<String, List<Prize>> store_prizes = er.getPrizes(prizesFilename);
      File results = new File("results.csv");
      PrintWriter writer = null;
      try {
        writer = new PrintWriter(results);

        WinnerPicker winnerPicker = new WinnerPicker();
        for (Branch branch : keys) {
          // writer.println(branch.getBranch_name() + " : " + entries.get(branch).size());

          List<Entry> branch_entries = entries.get(branch);

          for (Prize prize : store_prizes.get("Store")) {
            Winner winner = winnerPicker.pickWinner(prize, branch_entries);
            winner.getEntry().getPrizes().add(prize);

            Prize current_branch_prize = new Prize(prize);
            current_branch_prize.setWinner(winner);
            branch.getPrizes().add(current_branch_prize);

            writer.print(branch.getAccount());
            writer.print(",");
            writer.print(branch.getBranch_name());
            writer.print(",");
            writer.print(prize.getPrize_description());
            writer.print(",");
            writer.print(winner.getEntry().getCustomer_name());
            writer.print(",");
            writer.print(winner.getEntry().getTelephone());
            writer.print(",");
            writer.println(winner.getEntry().getAddress());
          }
        }
      } catch (FileNotFoundException e1) {
        // TODO Auto-generated catch block
        e1.printStackTrace();
      } finally {
        writer.close();
      }

    } catch (Exception e3) {
      errorLabel.setText(e3.getMessage());
    }
  }